#1B238B#1B238B

#1B238B is a dark, vivid blue. Relative luminance 0.033; OKLCH L 33.5% C 0.168 H 270.0°. Best body text is #FFFFFF at 12.65:1 contrast (WCAG AA passes).

Color values

HEX	#1B238B
RGB	rgb(27, 35, 139)
HSL	hsl(236, 67%, 33%)
HSV	hsv(236, 81%, 55%)
CMYK	cmyk(80.6%, 74.8%, 0%, 45.5%)
CIE-LAB	lab(21.20, 35.49, -57.93)
CIE-LCH	lch(21.20, 67.94, 301.49°)
OKLab	oklab(33.55% 0.0001 -0.1678)
OKLCH	oklch(33.55% 0.168 270)
XYZ	xyz(5.7116, 3.2985, 24.7567)
Luminance	0.0330 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B238B #8B831B

analogous

#1B5B8B #1B238B #4B1B8B

triadic

#1B238B #8B1B23 #238B1B

tetradic

#1B238B #8B1B5B #8B831B #1B8B4B

square

#1B238B #8B1B5B #8B831B #1B8B4B

split-complementary

#1B238B #8B4B1B #5B8B1B

monochromatic

#070925 #111658 #1B238B #2530BE #4550DB

Accessibility & contrast

On white

12.65

#1B238B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.66

#1B238B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B238B

12.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B238B	#FFFFFF	#000000	##FFFFFF
##1B238B	1.00	12.65	1.66	12.65
#FFFFFF	12.65	1.00	21.00	1.00
#000000	1.66	21.00	1.00	21.00
##FFFFFF	12.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00388E

Deuteranopia (green-blind)

#002D89

Tritanopia (blue-blind)

#004155

Achromatopsia (no color)

#333333

Design tokens & code

CSS

--color: #1b238b;
/* rgb */ color: rgb(27, 35, 139);
/* oklch */ color: oklch(33.5% 0.168 270.0);

Tailwind

colors: {
  custom: {
    50: '#6d5fae',
    500: '#1b238b',
    950: '#000000',
  },
}

SCSS

$custom: #1b238b;
$custom-light: #6d5fae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b238b",
  "rgb": {
    "r": 27,
    "g": 35,
    "b": 139
  },
  "hsl": {
    "h": 235.714,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.33549,
    "c": 0.16778,
    "h": 270
  },
  "luminance": 0.03299
}

Semantic roles & 50–950 ramp

primary

#1B238B

secondary

#BCB445

accent

#DE3DEA

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#080410

muted

#7B797F

Preview Lab

Preview with #1B238B

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →